<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>

<body>
    <div id="app">
        <!-- 将收集到的数据保存在data中 -->
         <input type="text" v-model.number.lazy="score">
        <div>
            <p v-if="score>90">成绩是A</p>
            <p v-else-if="score>70">成绩是B</p>
            <p v-else-if="score>50">成绩是C</p>
            <p v-else>成绩是D</p>
        </div>
    </div>

    <script>
        Vue.config.prodactionTip = false

        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    score: null
                }
            }
        })
    </script>
</body>

</html>